MDEV-17841 S3 storage engine

A read-only storage engine that stores it's data in (aws) S3

To store data in S3 one could use ALTER TABLE:
ALTER TABLE table_name ENGINE=S3

libmarias3 integration done by Sergei Golubchik
libmarias3 created by Andrew Hutchings

mysql-test/suite/s3/create_database.inc

@@ -0,0 +1,10 @@
+#
+# Create unique database to not conflict with concurrently running tests as
+# the s3 database is shared
+#
+
+let $database=`select concat("s3_test_",replace(uuid(),"-",""))`;
+--disable_query_log
+--eval create database $database;
+--eval use $database;
+--enable_query_log